Weathering breaks down or changes rock in place. Erosion moves material. Deposition leaves moved material in a new place. Water, ice, wind, and living things can act in different ways. A paper model can show separation and movement, but it cannot measure a natural erosion rate. Safety: Keep paper off the floor. Do not use dust, soil, fans, or mouths to move particles. Stop: Stop after one map and four cases. No blowing powders, running water experiments, freezing containers, or rock breaking.

Materials: Paper; Pencil; One scrap sheet to tear; Ruler 1. Draw a 20 cm river line from a hill at the left to a basin at the right. Label 0 cm Hill and 20 cm Basin. Tear the scrap into six pieces large enough to handle. Place them at the hill and trace their starting positions. 2. Tear one piece into two while leaving it at the hill. Label this Weathering analogy: smaller pieces, same place. Move three pieces by hand to 5, 10, and 15 cm. Measure and record each distance. Label movement Erosion analogy. 3. Move the piece from 15 cm to the 20 cm basin and leave it there and label Deposition analogy. Sketch before and after. State that your hand stands for transport, not for water itself. 4. Classify these supplied cases: water carries sand downstream; water freezes in a crack and repeated freezing can widen it; wind carries loose sand; a growing root widens an existing crack. For each, identify breakdown or transport. Write one evidence sentence using your measured paper movement. Done: A before-and-after map, three measured transport distances, labels for all three processes, and four case classifications are present. Proof: Keep the map and distance table. Note help measuring, moving pieces, or deciding which process occurred. Stop: Stop after one map and four cases. No blowing powders, running water experiments, freezing containers, or rock breaking.